countersinkn.

Brit.

/ˈkaʊntəsɪŋk/, U.S.

/ˈkaʊn(t)ərˌsɪŋk/

Etymology: < countersink v.

1. A tool for countersinking: see the verb.

ΘΚΠ

society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink

countersink1815

countersinker1881

counterbore1939

1815 J. Smith Panorama Sci. & Art I. 115 The head of the countersink is conical.

1849 J. Weale Rudim. Dict. Terms Archit. i. 124/2 Countersinks for iron have two cutting edges forming an obtuse angle.

2. The conical enlargement of the upper part of a hole for receiving the head of a screw or bolt. Cf. countersunk adj. Hence countersink bit, a bit for cutting a countersink.

ΘΚΠ

the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement

countersunk1794

countersink1846

counterborea1884

1846 J. E. Worcester Universal Dict. Eng. Lang. (citing Tanner).

1869 E. J. Reed Shipbuilding xvii. 330 The shank is conically shaped under the head in order to fit the countersink.

1879 Cassell's Techn. Educator (new ed.) IV. 135/2 Punching..has..the advantage of giving a slight countersink, or conical form to the hole.

This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2022).

countersinkv.

/ˌkaʊntəˈsɪŋk/

Forms: Past tense and participle countersunk.

Etymology: counter- prefix, apparently in a sense akin to 8 b, the hole being the counterpart of that which is to be sunk in it.

1. transitive. To enlarge the upper part of (a hole or cavity), usually into a conical form, to receive the head of a screw, bolt, etc.; to bevel the edge of a hole.

ΘΚΠ

society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head

countersink1831

counterbore1890

1831 J. Holland Treat. Manuf. Metal I. 170 The practice of countersinking the holes, to receive the nail heads.

1861 A. Wynter Our Social Bees 189 Counter-sinking the eyes in order that they may not cut the cotton.

1869 E. J. Reed Shipbuilding xxi. 482 The holes in the plates to receive the bolt-heads are countersunk one-half through the plates.

2. To sink the head of (a screw, bolt, etc.) in a depression made to receive it, so that it lies flush with the surface.

ΘΚΠ

society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head > sink screw-head into hole

countersink1815

1815 J. Smith Panorama Sci. & Art I. 70 The heads of the bolts must not project above the surface of the plate; therefore the grooves must be..wider at the top than the bottom, and the heads may then be countersunk.

1868 Queen's Regulations & Orders Army §573 b The horse's shoe is not to be grooved but simply punched, and the nails countersunk.

Derivatives

ˈcountersinker n. (a) a tool for countersinking; = countersink n. 1; (b) one who operates a countersinking machine.

ΘΚΠ

society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink

countersink1815

countersinker1881

counterbore1939

1881 Mechanic §319 The rose or roundheaded countersinker.

1881 Instr. Census Clerks (1885) 97

1921 Dict. Occup. Terms (1927) § 200

ˈcountersinking n.

ΘΚΠ

society > occupation and work > industry > working with tools or equipment > fastening > [noun] > with screws > enlarging hole to receive screw-head

countersinking1888

1888 Daily News 25 Apr. 6/1 Countersinking machines.

This entry has not yet been fully updated (first published 1893; most recently modified version published online December 2021).

单词	countersink
释义	countersinkn. Brit. /ˈkaʊntəsɪŋk/, U.S. /ˈkaʊn(t)ərˌsɪŋk/ Etymology: < countersink v. 1. A tool for countersinking: see the verb. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink countersink1815 countersinker1881 counterbore1939 1815 J. Smith Panorama Sci. & Art I. 115 The head of the countersink is conical. 1849 J. Weale Rudim. Dict. Terms Archit. i. 124/2 Countersinks for iron have two cutting edges forming an obtuse angle. 2. The conical enlargement of the upper part of a hole for receiving the head of a screw or bolt. Cf. countersunk adj. Hence countersink bit, a bit for cutting a countersink. ΘΚΠ the world > space > relative position > condition of being open or not closed > an opening or aperture > [noun] > a hole bored, pierced, or perforated > enlarging > an enlargement countersunk1794 countersink1846 counterborea1884 1846 J. E. Worcester Universal Dict. Eng. Lang. (citing Tanner). 1869 E. J. Reed Shipbuilding xvii. 330 The shank is conically shaped under the head in order to fit the countersink. 1879 Cassell's Techn. Educator (new ed.) IV. 135/2 Punching..has..the advantage of giving a slight countersink, or conical form to the hole. This entry has not yet been fully updated (first published 1893; most recently modified version published online March 2022). countersinkv. /ˌkaʊntəˈsɪŋk/ Forms: Past tense and participle countersunk. Etymology: counter- prefix, apparently in a sense akin to 8 b, the hole being the counterpart of that which is to be sunk in it. 1. transitive. To enlarge the upper part of (a hole or cavity), usually into a conical form, to receive the head of a screw, bolt, etc.; to bevel the edge of a hole. ΘΚΠ society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head countersink1831 counterbore1890 1831 J. Holland Treat. Manuf. Metal I. 170 The practice of countersinking the holes, to receive the nail heads. 1861 A. Wynter Our Social Bees 189 Counter-sinking the eyes in order that they may not cut the cotton. 1869 E. J. Reed Shipbuilding xxi. 482 The holes in the plates to receive the bolt-heads are countersunk one-half through the plates. 2. To sink the head of (a screw, bolt, etc.) in a depression made to receive it, so that it lies flush with the surface. ΘΚΠ society > occupation and work > industry > working with tools or equipment > fastening > fasten [verb (transitive)] > with screws > enlarge (hole) to receive screw-head > sink screw-head into hole countersink1815 1815 J. Smith Panorama Sci. & Art I. 70 The heads of the bolts must not project above the surface of the plate; therefore the grooves must be..wider at the top than the bottom, and the heads may then be countersunk. 1868 Queen's Regulations & Orders Army §573 b The horse's shoe is not to be grooved but simply punched, and the nails countersunk. Derivatives ˈcountersinker n. (a) a tool for countersinking; = countersink n. 1; (b) one who operates a countersinking machine. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > tools for enlarging holes > countersink countersink1815 countersinker1881 counterbore1939 1881 Mechanic §319 The rose or roundheaded countersinker. 1881 Instr. Census Clerks (1885) 97 1921 Dict. Occup. Terms (1927) § 200 ˈcountersinking n. ΘΚΠ society > occupation and work > industry > working with tools or equipment > fastening > [noun] > with screws > enlarging hole to receive screw-head countersinking1888 1888 Daily News 25 Apr. 6/1 Countersinking machines. This entry has not yet been fully updated (first published 1893; most recently modified version published online December 2021). < n.1815v.1815
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